2

B3FS-4

SMD Tactile Switch

■ Precautions

Be sure to read the safety precautions common to all Tactile Switches for correct use.

● PCBs

If the PCBs are separated after mounting the Switch, particles

from the PCBs may enter the Switch. If PCB particles or foreign

particles from the surrounding environment, workbench, contain-

ers, or stacked PCBs become attached to the Switch, contact

failure may result.

● Soldering

1. General Precautions

Before soldering the Switch on a multilayer PCB, test to confirm

that soldering can be performed properly. Otherwise the Switch

may be deformed by the soldering heat on the pattern or lands of

the multilayer PCB.

Do not solder the Switch more than twice, including rectification

soldering. An interval of five minutes is required between the first

and the second soldering, or it may result in melting housing and

deterioration of operating characteristics.

2.Reflow Soldering (Surface Mounting)

Solder the terminals within the heating curve shown in the follow-

ing diagram.

Note: The above heating curve applies if the PCB thickness is 1.6 mm.

The peak temperature may vary depending on the reflow bath

used. Confirm the conditions beforehand.

Do not use an automatic soldering bath for surface-mounted

Switches. The soldering gas or flux may enter the Switch and

damage the Switch's plunger operation.

3. Manual Soldering

Soldering temperature: 350 degC max. at the tip of the soldering

iron Soldering time: 3 s max. for a 1.6-mm thick, single-side PCB

Before soldering the Switch on a PCB, make sure that there is no

unnecessary space between the Switch and the PCB.

● Washing

This switch cannot be washed.

Doing so will cause the washing agent, together with flux or dust

particles on the PCB, to enter the Switch, resulting in malfunc-

tion.

● Packaging Specifications for Embossed Taping

● RoHS Compliant

The “RoHS Compliant” designation indicates that the listed mod-

els do not contain the six hazardous substances covered by the

RoHS Directive.

Reference:

The following standards are used to determine compliance for

the six substances.

Lead: 1,000 ppm max.

Mercury: 1,000 ppm max.

Cadmium: 100 ppm max.

Hexavalent chromium: 1,000 ppm max.

PBB: 1,000 ppm max.

PBDE: 1,000 ppm max.

Precautions for Correct Use

180

220

250 max.

Room

temperture

150

Preheating

Heating

Time (s)

60 to 120

Max.60

ø13.2

Reel (Material: PS)

Label

Tape drawing direction

Tape drawing direction

(29)

(5.6)

2

A

24

11.5

1.75

0

A

ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.

To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.